THE AMPHIPODA. 15 



in Greenland waters, and while C. mieronyx was known from no nearer habitat than 

 Tristan da Cunha, the distinctness of the two species had a sort of geographical support. 

 This, however, is greatly weakened by the finding of C. mlcroiujx in the Bay of Biscay, 

 and the earlier report of its capture by the Prince of Monaco's yacht I'Hirondelle at 

 47° 38' 13" N., 22° 13' 40" W. 



Occurrences : 21 k. 300 to 400 fathoms. 1 specimen. 

 82 I. 300 to 400 fathoms. 1 specimen. 



Fam. EusmiD^. 



EUSIROGENES, n. g. 



In general agreement with Eusirns, but with the head arching over the base of the 

 first antennae, distal margin of the upper lip straight, third joint of mandibular palp shorter 

 than second, inner plates of the maxillipeds completely separate, second gnathopods much 

 smaller than first, the fifth joint in both pairs proximally elongate with the cup-forming 

 process little developed. 



2. EusiROGENES DOLICHOCAEPUS, u. sp. (Plate 2 A.) 



Though the solitary specimen on which the new genus and species are founded was 

 both defective and damaged, a suSicient number of important features were in satis- 

 factory condition. The flagellum of the second antennne, the third and fourth per^eopods 

 and the thi-ee terminal joints of the first, second, and fifth pairs, the third uropods, and 

 the telson were entirely missing. The thin papyraceous integument was crumpled, 

 making it difl&cult to determine the exact relative positions of the side-plates. Nor 

 could their several shapes and sizes be determined prior to dissection. The back of the 

 perseon appeared to be rounded, not carinate, with little difi'erence in length between the 

 segments. Of the pleon-segments the first three were much longer, the second and third 

 much deeper, than those of tiie perteon. The postero-lateral angles of the third segment 

 are smoothly rounded, not serrate ; the fourth is longer than the fifth and sixth 

 combined, and has a saddle-like dorsal depression. On this and each of the three 

 preceding segments there seemed to be one or two postero-dorsal denticles, but these were 

 minute and it was not possible to determine whether they terminated carinas or mere 

 accidental folds of the pellucid skin. 



The mouth-organs were in good order, but collectively were most likely out of ppsition, 

 since the whole mass pointed downwards at right angles to the head, with the long palps 

 of the mandibles projecting fantastically between the gnathopods. The head itself was 

 opaque, longer than wide, without rostrum, though the curved sides of its triangular form 

 ended in a minute point. Beyond the base of the first antenmc it was hollowed into an 

 arch. It must, however, be borne in mind that the oral parts, though firmly knit 

 together among themselves, showed signs of a forcible dislocation by which the cephalic 

 framework may have had its appearance seriously modified. 

 Of eyes no trace was observable. 

 First antennce.— First joint rather long, with strong distal tooth on the inner side. 



